function nr(a){
	return a.length
}

function nc(a){
	return a[0].length
}

function sayDimensions(a){
	s=nr(a)+'x'+nc(a)
	return s;
}

function mat2string(a){
	s='';
	s+='<table>'
	for(var i=0;i<nr(a);i++){
		s+='<tr>'
		for(var j=0;j<nc(a);j++){
			s+='<td>'
			s+=a[i][j]
		}
	}
	s+='</table>'
	return s;
}

function writeInLine(){
	document.write('<table border=8 bordercolor=black><tr>')
	for(var i=0;i<arguments.length;i++){document.write('<td>'+arguments[i])}
	document.write('</table>')
}

function somma(a,b){
	c=new Array(nr(a));
	for(var k=0;k<nr(a);k++){c[k]=new Array(nc(a))}
	for(var i=0;i<nr(a);i++){
		for(var j=0;j<nc(a);j++){
			c[i][j]=a[i][j]+b[i][j]
		}
	}
	return c;
}

function diff( a, b){
	c=new Array(nr(a));
	for(var k=0;k<nr(a);k++){c[k]=new Array(nc(a))}
	for(var i=0;i<nr(a);i++){
		for(var j=0;j<nc(a);j++){
			c[i][j]=a[i][j]-b[i][j]
		}
	}
	return c;
}

function pms( m, s){
	c=new Array(nr(m));
	for(var k=0;k<nr(m);k++){c[k]=new Array(nc(m))}
	for(var i=0;i<nr(m);i++){
		for(var j=0;j<nc(m);j++){
			c[i][j]=s*m[i][j]
		}
	}
	return c;
}

function prodotto(a,b){
	c=new Array(nr(a));
	for(var k=0;k<nr(a);k++){c[k]=new Array(nc(b))}

	for(var i=0;i<nr(a);i++){
		for(var j=0;j<nc(b);j++){
			c[i][j]=0;
			for(var l=0;l<nr(b);l++){
				c[i][j]+=a[i][l]*b[l][j]
			}
		}
	}
	return c;
}